Unfortunately, your GMAT score probably puts you on the outside-looking-in at the schools you mentioned. Your background doesn't suggest highly unique experiences of the type that would allow a candidate to fall at the low end of the GMAT range for elite programs. I would suggest taking another crack at it to try for the 700 barrier or considering some schools with a softer GMAT range.
Darden might be within range, but you will have to really craft essays that showcase fit with the school. It has a unique culture and they prize that a great deal, so nailing the tone will be critical. Furthermore, you will need strong essays and interviews to compensate for your low verbal score on the test, as there may be concerns about communication, particularly at U.S. programs.
Hope this helps. Thanks for reaching out.
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